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Sender:'Shendry Rosero V' shendry.rosero.v@...
Date/Time:2017-Jan-31 17:08:56
Subject:RE: Re: Y P R drone vs Y P R hugin

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PanoTools NG: RE: Re: Y P R drone vs Y P R hugin 'Shendry Rosero V' shendry.rosero.v@... 2017-Jan-31 17:08:56
Thanks a lot. (with your responses)  I get it a better idea

S.R

-----Mensaje original-----
De: #removed# [mailto:#removed#] 
Enviado el: s?bado, 28 de enero de 2017 9:13
Para: #removed#
Asunto: [PanoToolsNG] Re: Y P R drone vs Y P R hugin

Am 27.01.2017 um 17:24 schrieb Shendry Rosero V:

> --I want to get a better mosaic (hugin for defect or than ODM [open] 
> pix4,
> agisoft[priced])

Does mosaic mean you don't shoot from the same viewpoint, like for an aerial
map?

Hugin is designed to stitch panoramas taken from the same viewpoint. 
Yaw, pitch and roll are the camera directions relative to this single
viewpoint.

In aviation these coordinates are relative to the flight direction. So as
soon as you fly in either direction hugins and your drones coordinates will
have nothing in common. Only if you turn on the spot there might be a
relationship for yaw, if you tilt the camera down for pitch. If your drone
rolls sideways (on the spot) roll might change.

However, all this won't help to get a better stitch. At best it might help
to pre-align images. The main problem is that your drone will not stay on
the spot but move due to wind gusts or navigation imprecision. 
This causes parallax and hence potentially unrecoverable errors.

In case you want to take a mosaic (take an image straight down, fly a
distance, take next image and so on), you face this same parallax problems.
This can be improved if you fly high, use a longer focal length and shoot
with large overlap. Same as for linear street panoramas:
http://www.dojoe.net/tutorials/linear-pano/
https://cloudacm.com/?p=2577
http://hugin.sourceforge.net/tutorials/Mosaic-mode/en.shtml
Or search on your own:
https://www.google.com/search?q=hugin+linear+panoramas

--
Erik Krause
http://www.erik-krause.de


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Posted by: "Shendry Rosero V" <#removed#>
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